Presence of sheathing leaf base and ligule are characteristic of

Sunken stomata are usually found in the leaves of

Environmental heterophylly with respect to habitat is seen in-

Free lateral stipules occur in

In $Opuntia$ (prickly pear),the spines are modified forms of:

Identify the correct terms for the following analogy-based question:
$(i)$ Leaf is attached to the stem by: Leaf base :: The swollen leaf base is called: ............
$(ii)$ In Neem: Pinnately compound leaf :: In Silk cotton: ............